Stop Mode; Mains Loss Mode - Emerson unidrive sp User Manual
Universal variable speed ac drive for induction and servo motors
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Also See for unidrive sp:
- User manual (268 pages) ,
- User manual (310 pages) ,
- Technical note (6 pages)
Table of Contents
Parameter
Keypad and
Parameter
structure
display
x.00
6.01
Stop mode
Drive modes
Open-loop, Closed-loop vector, Servo
Bit
SP
FI
Coding
Open-loop
Range
Closed-loop vector, Servo
Open-loop,
Default
Closed-loop vector
Servo
Update rate
Background read
Open-loop
Stopping is in two distinct phases: decelerating to stop, and stopped.
Stopping Mode
0: Coast
1: Ramp
2: Ramp followed by DC
injection
3: DC injection with zero
speed detection
4: Timed DC injection braking
stop
5:Disable
Once modes 3 or 4 have begun the drive must go through the ready state before being restarted either by stopping, tripping or being disabled.
If this parameter is set to 5 (Disable stopping mode) the disable stopping mode is used when the run command is removed and will allow the drive to
be started immediately by reapplying the run command. However, if the drive is disabled by removing the drive enable (i.e. via the secure disable
input or the drive enable (Pr 6.15)) then the drive cannot be re-enabled for 1s.
Closed-loop vector and Servo
Only one stopping phase exists and the ready state is entered as soon as the single stopping action is complete. It should be noted that the stop
condition is detected when the speed feedback is below the zero speed threshold (Pr 3.05) for at least 16ms. If the speed is not stable it is possible
that the stop condition is not detected. In this case the system should be made more stable or the zero speed threshold should be raised.
Stopping Mode
0: Coast
1: Ramp
2: No ramp
If coast stop is selected the inverter is inhibited immediately when the run command is removed. If however, hold zero speed is also selected (Pr 6.08
= 1), then the inverter will be re-enabled to hold zero speed. The result is that the inverter is disabled for one sample and then enabled to ramp the
motor to a stop. Therefore is coast stop is required Pr 6.08 should be set to zero to disable hold zero speed.
If stop with ramp is selected the relevant ramp rate is used to stop the motor even if Pr 2.02 is set to zero to disable ramps.
The motor can be stopped with position orientation after stopping. This mode is selected with the position controller mode (Pr 13.10). When this mode
is selected Pr 6.01 has no effect.
6.03
Mains loss mode
Drive modes
Open-loop, Closed-loop vector, Servo
Bit
SP
Coding
Range
Open-loop, Closed-loop vector, Servo
Default
Open-loop, Closed-loop vector, Servo
Update rate
Background read
0:
dis
There is no mains loss detection and the drive operates normally only as long as the DC bus voltage remains within specification (i.e. >Vuu). Once
the voltage falls below Vuu a UU trip occurs and this will reset itself if the voltage rises again above VuuRestart shown in the table below.
Unidrive SP Advanced User Guide
Issue Number: 10
Parameter
Advanced parameter
description format
descriptions
DE
TE
VM
DP
ND
1
0 to 5
0 to 2
1
1
2
Phase 1
Inverter disabled
Ramp down to zero frequency Wait for 1s with inverter enabled
Ramp down to zero frequency
Low frequency current
injection with detection of low
speed before next phase.
Inject DC at level specified by
Pr 6.06 for time specified by Pr
6.07.
Inverter disabled
Action
Inhibits the inverter
Stop with ramp
Stop with no ramp
FI
DE
TE
VM DP
ND
1
0 to 2
0
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Serial comms
Macros
protocol
RA
NC
NV
PT
US RW BU
1
1
Phase 2
Drive cannot be re-enabled for 1s Delay in phase 2 allows rotor flux to decay.
Inject DC at level specified by Pr
6.06 for time defined by Pr 6.07
Inject DC at level specified by Pr
6.06 for time defined by Pr 6.07
No phase 2.
No phase 2.
RA
NC
NV
PT
US RW BU
1
1
Electronic
Performance RFC mode
nameplate
PS
1
Comments
The drive automatically senses low speed and
therefore it adjusts the injection time to suit the
application. If the injection current level is too
small the drive will not sense low speed
(normally a minimum of 50-60% is required).
Allows the drive to be immediately disabled
and then re-enabled again immediately if
required.
PS
1
Menu 6
135
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